Extrinsic 12487-1

{
  "heartbeat": {
    "blockNumber": 12485,
    "sessionIndex": 208,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x1618bcda1dfbca7f782303ae3efad30b1f66e2c227be91cc9b8a9e096072223c252d0b551c6a20f80d50a19c711523edf2dbfbb0aa171091bc3a0551e6de2f8c"
}